I just thought I would ask some people's opinions about this as I am stuck on what to do. I am currently working for a food manufacturing company that pack their food with nitrogen gas to increase shelf life. However they have an acceptable limit of how much nitrogen can be within the product. Recently they have had some products that have come close to breaching this limit. The trouble is they do not know why every so often one item does. I took 100 samples of the products with two various nitrogen flow rates and it turns out that the deviation in the results of a higher flow rate is quite less then compared to the ones with a lower flow rate. However there still is the one or two randomly high values. The flow rates i tested were 16 and 14 m^3 / h with a pressure of about 3 bar. I am really stuck on what it could be. Does any one have any ideas?